get_class.php

<?php
/**
 * @property-read string $class_name
 */
abstract class rootClass{
	/**
	 * Contains the data for this class
	 * @var array
	 */
	protected $data = array();
	/**
	 * 
	 */
	public function __construct(){
		$this->addProperty('class_name', '');
		$this->setProperties();
	}
	/**
	 * Add a property to this class
	 * @param string $var the property being added
	 * @param mixed $default the default value
	 */
	protected function addProperty($var, $default = ''){
		$this->data[$var] = $default;
	}
	/**
	 * Set the properties of this subclass
	 */
	abstract protected function setProperties();
	/**
	 * Get the name of this class
	 * @return string
	 */
	public function __toString(){
		return get_class($this);
	}
	/**
	 *
	 * @param mixed $var
	 * @return mixed
	 */
	public function __get($var){
		if(array_key_exists($var, $this->data)){
			$value = $this->data[$var];
		} else {
			throw new Exception($var . ' does not exist in ' . $this->class_name);
		}
		$function = '_get'.strtolower(str_replace('_', '', $var));
		if(method_exists($this, $function)){
			$value = $this->$function($value);
		}
		return $value;
	}
	/**
	 * Set a variable in the class
	 * @param string $var
	 * @param mixed $value
	 * @return mixed
	 */
	public function __set($var, $value){
		$function = '_set'.strtolower(str_replace('_', '', $var));
		if(method_exists($this, $function)){
			 $this->data[$var] = $value = $this->$function($value);
		} elseif(array_key_exists($var, $this->data)) {
			$this->data[$var] = $value;
		}
		return $value;
	}
	/**
	 * Get the class name
	 */
	protected function _getClassName(){
		return $this->__toString();
	}
	/**
	 * Stop the setting of the classname
	 */
	protected function _setClassName(){
		throw new Exception('What\'re you trying to pull?');
	}
}

/**
 * @property string $var_one
 * @property number $var_two
 */
class childClass extends rootClass{
	/**
	 * Set the default properties for this class
	 * @see rootClass::setProperties
	 */
	protected function setProperties(){
		$this->addProperty('var_one', '');
		$this->addProperty('var_two', '');
	}
	/**
	 * Make sure that var_one is not 'test' and is a string
	 * @param  $value
	 * @return string
	 */
	protected function _setVarOne($value){
		if(!is_string($value)){
			throw new Exception('var_one needs to be a string');
		}
		if($value == 'test'){
			throw new Exception('var_one cannot be "test".');
		}
		return $value;
	}
	/**
	 * Make sure that var_two is numeric, if it is not set it to 0
	 * @param number $value
	 * @return number
	 */
	protected function _setVarTwo($value){
		if(!is_numeric($value)){
			$value = 0;
		}
		return $value;
	}
}


$c = new childClass();
$c->var_one = 'test';

echo $c->class_name;
echo $c->var_one;